Question

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Answer 1

a) x² - 7x = 0
x(x - 7) = 0
x - 7 = 0
x = 7/ x= 0 
b) x² + 5x = 0
x (x + 5) = 0
x + 5 = 0
x = -5/ x= 0 
c) 4x² - 9x = 0
x (4x - 9) = 0
4x - 9 = 0
4x = 9
x= 9/4 
x= 2.25/ x=0 
d) 3x² + 5x = 0
x (3x + 5) = 0
3x + 5 = 0
3x = -5
x= -5/3 
x= (aprox) -1,7/ x=0 
e) 4x² - 12x = 0
x (4x - 12) = 0
4x - 12 =0 
4x = 12
x = 12/4 
x= 3/ x=0
f) 5x² + x = 0
x( 5x + 1) = 0
5x + 1 = 0
5x = -1
x = -1/5 / x= 0 
g) x² + x= 0
x (x + 1) = 0
x + 1 = 0
x= -1/ x= 0 
h) 7x² - x = 0
x (7x - 1) = 0
7x - 1 = 0
7x = 1
x = 1/7; x=0 
i) 2x² = 7x
2x² - 7x = 0
x (2x - 7) = 0
2x - 7 = 0
2x = 7
x = 7/2 ; x=0 
j) 2x² = 8x
2x² - 8x = 0
x (2x - 8) = 0
2x - 8 = 0
2x= 8
x= 8/2
x=4/ x=0
l) 7x² = -14x
7x² + 14x = 0
x ( 7x + 14) = 0
7x + 14 = 0
7x = -14
x = -14/7
x= -2/ x=0 
m) -2x² + 10x = 0
x (-2x + 10) = 0
-2x + 10 = 0
-2x = -10
x= -10/-2 
x= 5/ x=0