Question

Simplify the expression
$2x {}^{2} - 3 {y}^{2} - 3 {y}^{2} + {y}^{2} + 5$
and find its value when x= -1 and y=2.
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Answer 1

$\huge \bold {Question:}$
Simplify the expression
$2x {}^{2} - 3 {y}^{2} - 3 {y}^{2} + {y}^{2} + 5$
and find its value when x= -1 and y=2.
​
$\huge \bold {Solution :}$

$2 {x}^{2} - 3 {y}^{2} - 3 {y}^{2} + {y}^{2}+ 5 \\ \\ = 2 { (- 1)}^{2} - 3({2)}^{2} - 3{(2)}^{2} +{2}^{2} + 5 \\ \\ = 2 \times 1 - 3 \times 4 - 3 \times 4 +4+5\\ \\ = 2 - 12 - 12 +9 \\ \\=2-24+9 \\ \\ = -22+9 \\ \\=( - 13)$

$\huge\bf\mathfrak\red{Thanks!}$