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Algebraic Expressions — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSAlgebraic Expressions1 Mark
MCQ
What should be added to $3x^2 + 4$ to get $9x^2 - 7?$
  • ✓
    $6x^2 - 11$
  • B
    $6x^2 + 11$
  • C
    $12x^2 - 11$
  • D
    $12x^2 + 11$
✓

Answer

Correct option: A.
$6x^2 - 11$

Since, $(9x^2 - 7) - (3x^2 + 4) = 9x^2 - 7 - ​3x^2 - 4 = 6x^2 - 11$
So, $6x^2 - 11$ should added to $3x^2 + 4$ to get $9x^2 - 7.$
Hence, the correct alternative is option $(a).$

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