Question

a2-b2=28 find a
please anwer quickly

Answer 1

Answer:

$(x + y)(x - y) = 28$

We got two equations.

$(x + y) = 28$

Eq-1

$(x - y) = 28$

Eq-2

From Eq-1

$x = 28 - y$

This is Eq-3. Putting Eq-3 in Eq-2

$28 - y - y = 28 \\ 28 - 2y = 28 \\ - 2y = 0 \\ y = 0$

Putting value of y in any of the Equations.

$x + y = 28 \\ x + 0 =28 \\ x = 28$