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Emma Bray
15 June, 15:54
X2+2x-15=0 factorising
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Belinda Banks
15 June, 16:13
0
x²+2x-15 = (x-3) (x+5)
Step-by-step explanation:
hello:
x²+2x-15=0
(x²+2x+1) - 1-15=0
(x+1) ²-16=0
(x+1) ²-4² = (x+1-4) (x+1+4) use identity : a²-b² = (a-b) (a+b)
x²+2x-15 = (x-3) (x+5)
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Gunnar Eaton
15 June, 16:55
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(x-3) (x+5)
Step-by-step explanation:
x²+2x-15 find two numbers that add to make + 2 and make a product of - 15
-3*5=-15
-3+5=2
(x-3) (x+5)
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