factorise x^2 +2x - 195
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Answered by
5
x²+2x-195=0
⇒x²+15x-13x-195=0
⇒x(x+15)-13(x+15)=0
⇒(x+15)(x-13)=0
x= 13 or -15
⇒x²+15x-13x-195=0
⇒x(x+15)-13(x+15)=0
⇒(x+15)(x-13)=0
x= 13 or -15
Answered by
2
x² + 2x - 195
= x² + 2x + 1 - 196
= (x + 1)² - (14)²
= (x + 1 + 14) (x + 1 - 14)
= (x + 15)(x - 13)
= x² + 2x + 1 - 196
= (x + 1)² - (14)²
= (x + 1 + 14) (x + 1 - 14)
= (x + 15)(x - 13)
phoebe1:
Thanks a lot
My pleasure :)
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