Question

Evaluate the expression when y=-7. y? +4y-1

Answer 1

Answer:

On substituting  $y = -7 , y^{2} + 4y -1 = 20$

Step-by-step explanation:

The given expression = $y^{2} + 4y -1$

Substitute y  = -7 in the above quadratic equation:

$(-7)^{2} + 4(-7) -1$  = (-7)(-7) + (-28) -1

= 49 -28 -1 = 49- 29 = 20

So, on substituting $y = -7, y^{2} + 4y -1 = 20$