Factorise by grouping method: 16 (a + b) ^ 2 - 4a - 4b Share with your friends Share 0 Priyanka Sahu answered this Dear Student, 16(a+b)² -4a -4b = 16(a+b)² - 4(a+b) = 4(a+b)(4a+4b-1) Regards -2 View Full Answer