
KS3/IGCSE Solving Quadratics
Presentation
•
Mathematics
•
8th Grade
•
Medium
Fiona Davidson
Used 7+ times
FREE Resource
13 Slides • 38 Questions
1
LO: Be able to factorise a quadratic
Be able to solve a quadratic equation
Recognise and use the Quadratic Formula
2
Multiple Select
Pick two numbers that
ADD to make 5 and MULTIPLY to make 6
2
5
1
3
3
Multiple Select
Pick two numbers that
ADD to make 8 and MULTIPLY to make 15
6
2
5
3
4
Multiple Select
Pick two numbers that
ADD to make 24 and MULTIPLY to make 80
10
4
20
8
5
Multiple Select
Pick two numbers that
ADD to make 18 and MULTIPLY to make 80
10
4
20
8
6
Multiple Choice
Expand:
4d + 2f
4d + 8f
4d2f
4d2f
7
Multiple Choice
Expand and simplify
2ab
2a + b
2a + 2b
2(ab)
8
Multiple Select
Which of these statements are equivalent to
8x+248(x + 24)
8(x + 3)
4(2x + 3)
4(2x + 6)
9
Multiple Choice
Expand and simplify:
7a + 7b + 3a
13a
10ab + 3a
10a + 7b
10
THE TRICK!
ADD to find the value in front of x
MULTIPLY to find the end value
11
Multiple Choice
Expand and Simplify
x2+7x+12
x2+5x+12
x2+12x+7
x2+3x+4x+12
12
Multiple Choice
Expand and Simplify
x2+18x+11
x2+11x+18
x2+10x+11
x2+9x+2x+18
13
Multiple Choice
Expand and Simplify
x2+11x−18
x2+11x+18
x2+7x−18
x2−7x−18
14
Pick TWO numbers that
ADD to make the value in front of x
MULTIPLY to make the end value
15
Multiple Select
Pick two numbers that
ADD to make 8
MULTIPLY to make 12
2
3
4
6
16
Multiple Select
Pick two numbers that
ADD to make -8
MULTIPLY to make -20
2
10
-10
-2
17
18
19
20
21
Multiple Select
Pick the solutions to
x=3
x=−3
x=5
x=−5
22
Multiple Select
Pick the solutions to
x=0
x=1
x=−2
x=2
23
Multiple Select
Pick the solutions to
x=8
x=−3
x=−23
x=−32
24
Multiple Select
Pick the solutions to
x=4
x=−21
x=−4
x=21
25
Multiple Select
Pick the solutions to
x=5
x=−41
x=−4
x=0
26
Multiple Select
Pick the solutions to
x=0
x=1
x=−8
x=8
27
Multiple Select
Pick the solutions to
x=10
x=3
x=−10
x=−3
28
29
When subtracting two square terms we can factorise by square rooting each term!
30
Multiple Choice
Factorise
x2−25(x+5)(x−5)
x(x−5)
(x−5)(x−5)
(x+5)(x+5)
31
Multiple Choice
Factorise
x2−81(x+9)(x+9)
x(x−9)
(x−9)(x+9)
x(x−81)
32
Multiple Choice
Solve
x2−81=0x=9
x=0 and x=9
x=−9
x=−9 and x=9
33
Multiple Choice
Solve
x2−81=0x=9
x=0 and x=9
x=−9
x=−9 and x=9
34
Before attempting to factorise you must rearrange to make your quadratic equal zero!
35
Multiple Choice
Solve
x2+5x=24x=8 and x=−3
x=−8 and x=3
x=12 and x=−2
x=2 and x=−12
36
We can solve Quadratics using a special formula known as the Quadratic Formula! We are given this in the exam so there is no need to memorise....we just need to know how to use it.
37
38
Multiple Select
Pick the TWO solutions
x=2
x=−31
x=−2
x=31
39
Multiple Choice
a, b, and c for
the quadratic equation:
4x2 – 8x = 3
*remember right side should =0
40
Multiple Choice
2x2 - 9x - 35 = 0
41
Multiple Choice
What should you do first in solving this equation?
x2 + 6x - 13 = 3
Factor
Write down: a = 1, b = 6, c = -13
Subtract 3 from both sides.
Add 3 to both sides.
42
Multiple Choice
x2 + 4x - 40 = -8
43
Multiple Choice
Use the quadratic formula to find the solutions for
y = -x2 - 5x + 12
No Real Solution
44
Multiple Choice
Use the quadratic formula to solve 2x2 + 2x - 12
-2, 3
2, 3
2, -3
-2, -3
45
Multiple Choice
Determine the values of a, b, and c for the quadratic equation:
4x2 – 8x = 3
a = 4, b = -8, c = 3
a = 4, b =-8, c =-3
a = 4, b = 8, c = 3
a = 4, b = 8, c = -3
46
Surd Form
A surd is an expression that includes a square root, cube root or other root symbol. Surds are used to write irrational numbers precisely – because the decimals of irrational numbers do not terminate or recur, they cannot be written exactly in decimal form.
47
Multiple Select
Select the surd(s)
5
51
5
−5
48
Multiple Choice
49
Multiple Select
Select the surd(s)
2+5
1−5
5
51
50
Multiple Choice
Use the quadratic formula to find the solutions for
y = -x2 - 5x + 12 (leaving the answer in surd form)
51
Multiple Choice
Solve w2+7w+4=0 (leaving the answer in surd form)
2−7±33
2−7±65
27±33
2−7±311
LO: Be able to factorise a quadratic
Be able to solve a quadratic equation
Recognise and use the Quadratic Formula
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