Question

y^2-30(y+2)-4 factorise ​

Answer 1

Step-by-step explanation:

=> y^2 - 30y - 60 - 4 = 0

=> y^2 - 30y - 64 = 0

=> y^2 - 32y + 2y - 64 = 0

=> y(y-32) + 2(y-32) = 0

=> y=32 , y= -2

Answer 2

y²-30(y+2)-4

y²-30y+60-4

y²-30y+56

By using D = b² - 4ac

= (-30)² - 4(1)(56)

= 900 - 224

= 676

$\alpha = \frac{ - b + \sqrt{D} }{2a} \\ \: \: \: \: \: \: \: \: \: = \frac{ - ( - 30) + \sqrt{676} }{2(1)} \\ = \frac{30 - 26}{2} \\ = \frac{4}{2} \\ = 2$