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PtichkaEL [24]
3 years ago
14

Find the roots. 2x 2 + 7x - 15 =0

Mathematics
2 answers:
sdas [7]3 years ago
7 0

Answer:

-5, 3/2

Step-by-step explanation:

Reika [66]3 years ago
4 0
So you always want to pull out the gcf first but since there isn't one, we can move on.
so we can make an acb chart which is multiplying the a value and the c value and find factors that of that product that will equal the b value.
a value is 2
c value is -15
b value is 7
-30 factors to equal 7 = 10, -3
10 - 3 = 7
so the factors 10 and -3 work. 
so now you make 2 separate parenthesis with one of the factors and one x. and it should be set equal to 0.
(x+10)(x-3) = 0
now solve for x in each separate parenthesis. 
x = -10 
x = 3
those r the roots
hope this helps
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