MCQ
Tick $(\checkmark)$ the correct answer:
$\left(3 q+7 p^2-2 r^3+4\right)-\left(4 p^2-2 q+7 r^3-3\right)=?$
  • A
    $\left(p^2+2 q+5 r^3+1\right)$
  • B
    $\left(11 p^2+q+5 r^3+1\right)$
  • C
    $\left(-3 p^2-5 q+9 r^3-7\right)$
  • $\left(3 p^2+5 q-9 r^3+7\right)$

Answer

Correct option: D.
$\left(3 p^2+5 q-9 r^3+7\right)$
D.  $\left(3 p^2+5 q-9 r^3+7\right)$
Solution:
$\left(3 q+7 p^2-2 r^3+4\right)-\left(4 p^2-2 q+7 r^3-3\right) $
$=3 q+7 p^2-2 r^3+4-4 p^2+2 q-7 r^3+3 $
$=5 q+3 p^2-9 r^3+7 $
$=3 p^2+5 q-9 r^3+7$

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