Question

The equation x2 – 1x – 90 = 0 has solutions {a, b}. What is a + b?

–19
–9
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@Florisalreadytaken

Answer 1

\[ ax^2+bx+c \Rightarrow x^2 - 1x - 90 = 0 \]
am gonna use the quadratic formula this time as well -- i dont like factoring
we can see that

\( a=1 \) ; \( b=-1 \) ; \( c=-90 \)
the quadratic formula is in this form: \( \frac{-b\pm\sqrt{b^2-4ac}}{2a} \)

can you plug the numbers n and solve for \( x_1 \) and \( x_2 \)???