factorise the following using identities: 9x^2 + 42x + 49-y^4 Share with your friends Share 4 Varun.Rawat answered this 9x2 + 42x + 49 - y4=9x2 + 42x + 49 - y4=3x2 + 2×3x × 7 + 72 - y4=3x + 72 - y22=3x + 7 + y23x + 7 - y2 6 View Full Answer
