Question

Find the sum of the like terms. 

i) 5x, 7x

ii) 7x²y, -6x²y

iii) 2m, 11m

iv) 18ab, 5ab, 12ab

v) 3x², -7x², 8x²

vi) 4m², 3m², -6m², m²

Answer 1

i) 5x + 7x = 12x

ii) 7x²y + (-6x²y) 

= (7 – 6) x²y = x²y

iii) 2m + 11m 

= (2 + 11)m = 13m

iv) 18ab + 5ab + 12ab 

= (18 + 5 + 12) ab

= 35ab

v) 3x + (-7x) + 8x  

= (3 – 7 + 8) x²

= (11 – 7) x²

= 4x²

vi) 4m” + 3m² +(-6m²) + m² 

= (4 + 3 – 6 + 1) m²

= (8 – 6) m²

= 2m²