25 a² + 20 ab + 4 b²
for formula

find u,v such that: u.v = a
and u+v = b then group according to

=

factor out 5a from :

factor out 2b from :

=

factor out :

=

Refine:

hope this helps!.
squaring something multiplies it by itself. -4^2 = -4*-4 = 16
Answer:
a:30 b:70 c:80
Step-by-step explanation:
triangle= 180*
3:7:8= 180*
7+3+8= 18
180/18= 10
a= 3x10= 30*
b=7x10= 70*
c=8x10= 80*
Answer:
(5,-3)
Step-by-step explanation:
y+3 = 3x-15
y= -2x + 7
plulg y in
-2x+7+3 = 3x-15
combine like terms
-2x+10 = 3x-15
add 2x to both sides and add 15 to both
5x=25
x=5
y=-2(5) + 7
y= -10 + 7
y= -3
(5,-3)