Question

if x = -15 and Y = 1 \ 2 then find the value x + 2y​

Answer 1

formulae,

a3−b3=(a−b)(a2+ab+b2)

a3+b3=(a−b)(a2−ab+b2)

given,

(5y+y15)(25y2−75+y2225)

=(5y)3+(y15)3

=125y3+y33375

=125(1)3+133375

=3500

Answer 2

$\huge\green{A}\orange{n}\blue{s}\pink{w}\purple{e}\red{r}$

$\tt \: x + 2y \\ \tt \: putting \: the \: values \: of \: x = - 15 \: and \: y = \frac{1}{2} \\ \tt \: - 15 + 2 \times \frac{1}{2} \\ \tt \: - 15 + 1 \\ \tt \: - 14$