Question

Simplify √49 + [√81 - x(9x = 14)]

Answer 1

`\longrightarrow{\green{- 9 {x}^(2) + 14x + 16}}`

`\large\mathfrak{{\pmb{\underline{\red{Step-by-step\:explanation}}{\orange{:}}}}}`

`√(49) + [ √(81) - x \: (9x - 14) ] \\ \\ = √(7 * 7) + [ √(9 * 9) - 9 {x}^(2) + 14x] \\ \\ = \sqrt{( {7})^(2) } + [ \sqrt{ ({9})^(2) } - 9 {x}^(2) + 14x ] \\ \\ (∵ \sqrt{ ({x})^(2) } = x ) \\ \\ = 7 + (9 - 9 {x}^(2) + 14x) \\ \\ = 7 + 9 - 9 {x}^(2) + 14x \\ \\ = - 9 {x}^(2) + 14x + 16`

`\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{♡}}}}}`