Using the formula for squaring a binomial, evaluate the following… - Vidyadip

Question

Using the formula for squaring a binomial, evaluate the following:
$(78)^2$

✓

Answer

$(78)^2$
$= (80-2)^2$
$= (80)^2-2 \times 80 \times 2+(2)^2$
$= 6400-320+4$
$= 6404-320$
$= 6084$

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 "2 Mark Question" from Operations on Algebraic Expressions→Operations on Algebraic Expressions — all question types→Maths STD 8 question papers→Maharashtra Board STD 8 question papers→Maharashtra Board question paper generator→

Similar questions

Which of the following numbers are perfect cubes? In case of perfect cube, find the number whose cube is the given number.
$9261$

Define the following terms:
Quadrilateral

Express the following as a rational number of the form $\frac{\text{p}}{\text{q}}:$
$\frac{15}{2}+\frac{9}{8}+\frac{-11}{3}+6+\frac{-7}{6}$

Solve:
$4 x^2+12 x y+9 y^2$

Evaluate:$\sqrt{1.69}$

A shop selling sewing machines offers 3% discount on all cash purchases. What cash amount does a costmer pay for a sewing machine the price of which is market as Rs. 650.

Find the length of 13.2kg of copper wire of diameter 4mm, when 1 cubic cm of copper weighs 8.4gm.

Write down the number of vertices of the following figures:
Tetrahedron.

Evaluate:
$\Big(\frac{-5}{8}\Big)^{-1}$

Factorize of the following expressions:
$x^2+x y+x z+y z$