A+3-5=10 a=?

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Step-by-step explanation:

a + 3 - 5 = 10

When subtracting 3 -  5 we get - 2

a - 2 = 10

Now adding 2 on both sides we get

a - 2 + 2 = 10 + 2

a = 12

Hope it will be helpful :)

Step-by-step explanation:

if alpha and beta are the zeros of the polynomial x2-2x-15, then form a quadratic polynomial whose zeros are 2alphaand ...