Question

9a-ab+5b if a=2 and b=7

Answer 1

9×2-2×7+5×7=18-14+35=39

Answer 2

$Solution, 9\left(2\right)-\left(2\right)\left(7\right)+5\left(7\right)=39$

$Steps:$

$9\left(2\right)-\left(2\right)\left(7\right)+5\left(7\right)$

$Follow\:the\:PEMDAS\:order\:of\:operations$

$\mathrm{Multiply\:and\:divide\:\left(left\:to\:right\right)}\:9\left(2\right),\\9\left(2\right)=18,\\18-\left(2\right)\left(7\right)+5\left(7\right)$

$\mathrm{Multiply\:and\:divide\:\left(left\:to\:right\right)}\:\left(2\right)\left(7\right),\\\left(2\right)\left(7\right)=14,\\18-14+5\left(7\right)$

$\mathrm{Multiply\:and\:divide\:\left(left\:to\:right\right)}\:5\left(7\right),\\5\left(7\right)=35,\\18-14+35$

$\mathrm{Add\:and\:subtract\:\left(left\:to\:right\right)}\:18-14+35,\\18-14=4,\\4+35,\\4+35=39,$

$\mathrm{The\:Correct\:Answer\:is\:39}$

$\mathrm{Hope\:This\:Helps!!!}$

$\mathrm{-Austint1414}$