Question

solve question no 15 16 and 17 this question is belong for class 8 maths please solve it step by step☺☺☺☺

Answer 1

$\bf{\underline {B. Fill \: \: in \: \:the \: \:missing\: \: term,making }}$
$\bf{\underline {a \: \:perfect \: \:trinomial\: \: square : }}$

$\bf{12.}$n² + ? + 49

[ °.° (a+b)² = a² + 2ab +b² ]

=> (n)² + 2*n*7 + (7)²

=> n² + 14n + 49

Hence, $\bf{14n}$ is the missing term in n² + ? + 49

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$\bf{13.}$ x² - ? + 25

[ °.° (a-b)² = a² - 2ab +b² ]

=> (x)² - 2*x*5 + (5)²

=> x² - 10x + 25

Hence, $\bf{10x}$ is the missing term in x² - ? + 25

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$\bf{14.}$b² - ? + 9

[ °.° (a-b)² = a² - 2ab +b² ]

=> (b)² - 2*b*3 + (3)²

=> b² - 6b + 9

Hence, $\bf{6b}$ is the missing term in b² - ? + 9

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$\bf{15.}$ ? + 16x + 64

[ °.° (a+b)² = a² + 2ab +b² ]

=> (x)² + 2*x*8 + (8)²

=> x² + 16x + 64

Hence, $\bf{x}$² is the missing term in ? + 16x + 64

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$\bf{16.}$ p² - 10pq + ?

[ °.° (a-b)² = a² - 2ab +b² ]

=> (p)² - 2*p*5q + (5q)²

=> p² - 10pq + 25q²

Hence, $\bf{25q}$² is the missing term in p² - 10pq + ?

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$\bf{17.}$ ? - 12x + 9

[ °.° (a-b)² = a² - 2ab +b² ]

=> (2x)² - 2*2x*3 + (3)²

=> 4x² - 12x + 9

Hence, $\bf{4x}$² is the missing term in ? - 12x + 9