Question

If x2 + 12 = 7; find the value of : 7x3 + 8x - 7/3 - 8/

Answer 1

Step-by-step explanation:

$x2 + 12 = 7 \\ \\ 2x + 12 = 7 \\ \\ 14x = 7 \\ \\ x = \frac{14}{7} = 2 \\ \\ \\ \\ \\ \\ find \: the \: value \: of \: \\ 7x3 + 8x - 7 \div 3 - 8 \\ \\ 7x11x - 7 \div 3 - 8 \\ \\ 18x + 7 \div 3 - 8 \\ \\ 25x \div - 5 \\ \\ x = \frac{25}{5} = 5 \\ = 5 \: is \: the \: value. \\ \\ mark \: \\ \\ my \: \\ \\ answer \\ \\ inbox \\ \\ me \\ \\ i \: \\ \\ hope \\ \\ it \\ \\ help \\ \\ you \\ \\ good \\ \\ evening$