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Maths MCQ

Algebraic Expressions and Operations on them · Maharashtra Board STD 7 (MSBSHSE - Semi English Medium). 2 questions.

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2 questions · timed · auto-graded

MCQ 11 Mark
The product of $\left(23 x^2 y^3 z\right)$ and $\left(-15 x^3 y z^2\right)$ is.............
  • A
    $-34 x^5 y^4 z^3$
  • B
    $34 x^2 y^3 z^5$
  • C
    $145 x^3 y^2 z$
  • ✓
    $170 x^3 y^2 z^3$
Answer
Correct option: D.
$170 x^3 y^2 z^3$
$170 x^3 y^2 z^3$
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MCQ 21 Mark
Simplify (3x – 11y) – (17x + 13y) and choose the right answer.
  • A
    7x – 12y
  • B
     -14x – 54y
  • C
    -3(5x + 4y)
  • ✓
    -2(7x + 12y)
Answer
Correct option: D.
-2(7x + 12y)
-2(7x + 12y)

Hints :
(3x – 11y) – (17x + 13y) = 3x – 11y – 17x – 13y
= – 14x – 24y
= – 2 × 7x – 2 × 12y
= – 2(7x + 12y)

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