Question

if a + b is equal to 2 and a minus b is equals to 10 find the value of a square + b square and ab

Answer 1

Hey, here is your answer . May it help you.

Answer 2

Use elimination method and add the equation
a + b = 2
a - b = 10
2a = 12
a = 6
b = - 4

${a}^{2} + {b}^{2} + ab \\ {6}^{2} + {( - 4)}^{2} + 6 \times - 4$
$36 + 16 \: - 24$
$52 - 24 = 28$
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