factorise x²+7x+129
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1.1 Factoring x2-7x-129
The first term is, x2 its coefficient is 1 .
The middle term is, -7x its coefficient is -7 .
The last term, "the constant", is -129
Step-1 : Multiply the coefficient of the first term by the constant 1 • -129 = -129
Step-2 : Find two factors of -129 whose sum equals the coefficient of the middle term, which is -7 .
-129 + 1 = -128
-43 + 3 = -40
-3 + 43 = 40
-1 + 129 = 128
Observation : No two such factors can be found !!
Step-by-step explanation:
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