Evaluate : (6 − 5xy) (6 + 5xy) - Vidyadip

Question

Evaluate : $(6 − 5xy) (6 + 5xy)$

✓

Answer

$(6 − 5xy) (6 + 5xy)$
$= (6)^2− (5xy)^2$
$= 36 − 25x^2y^2 .........[ \because (a − b) (a + b) = a^2b^2]$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[4 marks sum]" from Identities→Identities — all question types→MATHS STD 8 question papers→ICSE Board STD 8 question papers→ICSE Board question paper generator→

Similar questions

Use the product $(a + b) (a – b) = a^2 – b^2$ to evaluate : $103 \times 97$

Find the quotient and the remainder when : $a^3− 5a^2 + 8a + 15$ is divided by $a + 1$. verify your answer.

A parallelogram has sides of $20\ cm$ and $30 \ cm$. If the distance between its shorter sides is $15\ cm$; find the distance between the longer sides.

The weights (in kg) of 30 students are given below :
$
\begin{array}{l}
48,55,30,43,41,36,48,37,34,38,46,42,38,52,37 \\
34,40,42,50,37,35,46,42,45,43,37,39,45,48,46
\end{array}
$
Form the grouped frequency table by taking class-intervals
$30-35,35-40,40-45,45-50$, $50-55$.

Divide : $8 a^3 b-16 a^2 b^2-6 a^4 b^3 b y-2 a^2 b$

Expand : $(a+b−c)^2$

Expand : $(x + 5y)^3$

Solve : $13(x - 4) - 3(x - 9) - 5(x + 4) = 0$

Find : $a^2 + b^2 + c^2,$ if $a + b + c = 9$ and $ab + bc + ca = 24$

Find the volume and total surface area of a cube whose each edge is : $(i) 8\ cm\ (ii) 2\ m\ 40\ cm.$