2x2 + 15 = 11x ? Can be only for some values of x.
2x2 + 15 = 11x subtract 11x to both sides
2x2 - 11x + 15 = 0
(2x - 5)(x - 3) = 0
2x - 5 = 0 or x - 3 = 0
x = 5/2 or x = 3
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It cannot be factored because the discriminant is less than zero. Do you mean x2+11x-60 then if so it is (x-4)(x+15)
Yes that is correct
If 40 plus x equals 25 then x is equal to -15.
15
7+x=15 x=8