Question

If a = -3 and b = 7, find the value of 4(a2 + b2

) + 4 –ab.​

Answer 1

Answer:

256 is the correct answer

Answer 2

$= 4( {a}^{2} + {b}^{2} ) + 4 - ab$

$= 4( { - 3)}^{2} + ( {7)}^{2} + 4 - (- 3 \times 7)$

$= 4(9) + 49 + 4 - ( - 21)$

$= 36 + 49 + 4 + 21$

$= 85 + 25$

$= 110$