3m^2+2p^2-15
3(3)^2+2(10)^2-15
3(9)+2(100)-15
21+200-15
206
Step-by-step explanation:
angle B = angle E
angle C = angle F
AC= DF
BC = EF
If i were you, i would add one to 7x and fifteen. this gives you x^2+8x+16, a perfect square of x+4.
Remember to distribute invibile -1
simlify 2nd part
-(a^2-3a+7)=-1(a^2-3a+7)=-a^2+3a-7
now we have
3a^2+2a-2-a^2+3a-7=
3a^2-a^2+2a+3a-2-7=
2a^2+5a-9