Question

ajude nas equações de 2 grau a)4x²-36=0 b)7x²-21=0 d)x²-49=0 e)5x²-20=0

Answer 1

a)4x²-36=0 ==> 4x²=36x²=9 ==> x=+/-3==================================================b)7x²-21=0==>7x²=21 ==>x²=3 ==> x= +/-√3=========================================d)x²-49=0 ==>x²=49==> x= +/-7=========================================
e)5x²-20=0==>5x²=20==>x²=4==> x = +/-2