Question

What value for c will make the expression a perfect square trinomial? x2 – 7x + c

Answer 1

agar iska answer tumko pata chala to hamko bhi batana ham sure nahi h

Answer 2

x² - 7x + c

Let the root of c be y then.

-7x = 2xy

This is gotten from :

(a + b) ² = a² + 2ab + b²

Solving for y :

-7x = 2xy

y = - 7/2

Y = - 3.5

C = y²

C = 3.5² = 12.25

So the value of C should be 12.25