Question

6)
d) x - x - 30 = (x + 5)(x
1
or
2
e) 2x + 7x + 3 = (2x + 1)(x + 3) Therefore, x = -
2
Therefore, x =
or
3
1) 3x² + x - 2 = (3x - 2)(x + 1)
g) x? - 2x + 1 = (x - 1)
Therefore, x = 1, 1.
Exercise 1.5
2. Solve 18 x2 – 3x = 6
1. Solve x2 + 16 = 10x
3. Solve 50 x2 - 72 = 0
4. Solve x(2x - 1) = 3
5. Solve (x + 3)(x - 5) = -7
6. Solve x2 - x - 12 = 0
7. Rewrite the following quadratic equations in factoring forms.
) x - x - 20 = 0
b) 2x2 + 3x - 5 = 0​

Answer 1

ANS 1   18+2X-3X=6

18-X=6

-X=-12

X=12

ANS 2   2X+16=10X

16=8X

X=2

ANS 3  50+2X-72=0

-22+2X=0

2X=22

X=11

ANS 4  X(2X-1)=3

2X^2-X=3

(X+3)(X-5)=-7

X^2+(3+(-5))X+3*-5=-7

X^2-2X-15=-7

X^2-2X=8

X^2(-2X=8)

X^2(X=-4)

16