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Salas
Mathematics
17 March, 08:54
Which are the solutions of x^2 = - 7x - 8?
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Mcbride
17 March, 09:02
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The first term is, x2 its coefficient is 1.
The middle term is, - 2x its coefficient is - 2.
The last term, "the constant", is - 3
Step-1 : Multiply the coefficient of the first term by the constant 1 • - 3 = - 3
Step-2 : Find two factors of - 3 whose sum equals the coefficient of the middle term, which is - 2.
-3 + 1 = - 2 That's it
Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, - 3 and 1
x2 - 3x + 1x - 3
Step-4 : Add up the first 2 terms, pulling out like factors:
x • (x-3)
Add up the last 2 terms, pulling out common factors:
1 • (x-3)
Step-5 : Add up the four terms of step 4:
(x+1) • (x-3)
Which is the desired factorization
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Malia
17 March, 09:10
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First put in standard form and do factoring or the quadratic formula
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