Question

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Answer 1

(x+6)(x+2) =140

x² +2x+6x+12=140

x² +8x+12=140

x² +8x-128=0

...

64-4.1.-128 = 576

...

-8 +/- √576 / 2.1

x = -8+24 / 2 = 16/2

x=8

Answer 2

Resposta:

$x+6*x+2=140cm^{2} \\x+6x=138\\\\x=\frac{138}{7} \\x=19,7\\\\2P=(2* (19,7 + 6)) + (2*(19,7+2))\\2P = 51,4 + 43,4\\2P = 94,8$