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Alex17521 [72]
3 years ago
5

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

Mathematics
2 answers:
stira [4]3 years ago
8 0
9×2-2×7+5×7=18-14+35=39
schepotkina [342]3 years ago
6 0

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}

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