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Algebraic Expressions and Identities — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSAlgebraic Expressions and Identities2 Marks
Question
Simplify $3x (4x – 5) + 3$ and find its values for $x = 3$.
✓

Answer

We have $3x (4x - 5) + 3$
$3x (4x - 5) + 3 = 3x (4x) - 3x(5) + 3$
$= 12x^2- 15x + 3$
Putting $x = 3$ in above equation, we get $12 (3)^2- 15(3) + 3$
$= 12 (9) - 45 + 3$
$= 108 - 42 = 66$

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