Answer:
Q4. (-7)
Q5. (-8)
Step-by-step explanation:
The perfect square:
[tex](a+b)^2=a^2+2ab+b^2[/tex]
Q4
We have
[tex]y^2+14y+49=0\\\\y^2+2(y)(7)+7^2=0\\\\(y+7)^2=0\iff y+7=0\qquad\text{subtract 7 from both sides}\\\\\boxed{y=-7}[/tex]
Q5
We have
[tex]y^2+16y+64=0\\\\y^2+2(y)(8)+8^2=0\\\\(y+8)^2=0\iff y+8=0\qquad\text{subtract 8 from both sides}\\\\\boxed{y=-8}[/tex]
