Question : $9x^2+25 - 30x$ can be expressed as the square of:
Option 1: $-3x - 5$
Option 2: $3x+5$
Option 3: $3x-5$
Option 4: $3x^2-25$
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Answer (1)
23rd Jan, 2024
Correct Answer: $3x-5$
Solution :
Given:
$9x^2+25-30x$
= $9x^2-30x+25$
= $(3x)^2-2×3x×5+(5)^2$
= $(3x-5)^2$
Hence, the correct answer is $(3x-5)$.
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