What value of b makes the expression x^2 + bx + 4 a perfect square?
1
0
2
4

b=2 makes the equation a perfect square.

Step-by-step explanation:

As long as you factorize out the equation, you'll get a result of (x+2)^2. This multiplied using foil gives you, x^2 + 2x + 4. Making it a perfect square. You could also have -2 = b which makes a perfect square, but that's not in the options.

180

step-by-step explanation:

12-2=10

20-2=18

18x10=180