Question
Factorise: $9a^2b - 25$
✓
Answer
Using: $a^2-b^2=(a+b)(a-b)$
$=(3 a b)^2-(5)^2$
$=(3 a b+5)(3 a b-5)$
$=(3 a b)^2-(5)^2$
$=(3 a b+5)(3 a b-5)$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Find $x$ in figure:
→Find the value of a, if:
$p q^2 a=(4 p q+3 q)^2-(4 p q-3 q)^2$
→$p q^2 a=(4 p q+3 q)^2-(4 p q-3 q)^2$
Factorize:
$2x^3y^2- 4x^2y^3+ 8xy^4$
→$2x^3y^2- 4x^2y^3+ 8xy^4$
Test the divisibility of the following numbers by $7: 3467$
→Divide $x^5+x^4+x^3+x^2+x+1$ by $x^3+1$
→Write the following numbers in usual form:
$5.17 × 10^6$
→$5.17 × 10^6$
Solve:
$(x-4 y)^2-625$
→$(x-4 y)^2-625$
Test the divisibility of the following numbers by $11:379654$
→Find the least number which must be added to each of the following numbers, so as to get a perfect square. Also, find the square root of the perfect square, so obtained.
1750
1750
Two persons could fit new windows in a house in $3$ days. How many persons would be needed to fit the windows in one day?
→