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Algebraic Expressions — MATHS STD 7 — Question

Gujarat BoardEnglish MediumSTD 7MATHSAlgebraic Expressions1 Mark
MCQ
What should be subtracted from $2a + 6b - 5$ to get $-3a + 2b + 3?$
  • A
    $5 + 4b - 8$
  • ✓
    $5a + 4b - 8$
  • C
    $5a + 4ab - 8$
  • D
    $5a + 4b - 10$
✓

Answer

Correct option: B.
$5a + 4b - 8$

Let $X = -3a + 2b + 3$ and $Y = 2a + 6b - 5$
Let $Z$ be the required expression
Now, $X = Y - Z = > Z = Y - X$
$2a + 6b - 5 - (-3a + 2b + 3)$
$= 2a + 6b - 5 + 3a - 2b - 3$
$= 5a + 4b - 8$

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