Question

(5X^2 + 2) - (-4X^2 + 7) + (-3X^2 - 5) = ?

Answer 1

Step-by-step explanation:

$= ( {5x}^{2} + 2) - ( - 4 {x}^{2} + 7) + ( - 3 {x}^{2} - 5) \\ = 5 {x}^{2} + 2 + 4 {x}^{2} - 7 - 3 {x}^{2} - 5 \\ = 6 {x}^{2} - 10 \\ \\ \\ its \: solutin \: is \: ... \\ \\ 6 {x}^{2} - 10 = 0 \\ 6 {x}^{2} = 10 \\ {x}^{2} = \frac{10}{6} \\ {x}^{2} = \frac{5}{3} \\ x = \sqrt{ \frac{5}{3} } \: \: or \: \: \: \: x = - \sqrt{ \frac{5}{3} }$