Solving Quadratics by Factorising

Question 1:

4 x2+25x+25 = 0
x =−54 or −5

Question 2:

4 x2+13x+3 = 0
x =−14 or −3

Question 3:

3 x2+x−4 = 0
x =−43 or 1

Question 4:

5 x2+11x+6 = 0
x =−65 or −1

Question 5:

6 x2+23x+20 = 0
x =−43 or −52

Question 6:

6 x2+5x−25 = 0
x =−52 or 53