Edexcel – foundation
(a) \( \text{Simplify } 5x^4 + 11x^4 - 3x^4 \\ \rule{0pt}{1cm} \) (1 mark)
(b) \( \text{Simplify } (15p + 21p) \div 6 \\ \rule{0pt}{1cm} \) (1 mark)
\begin{aligned} &5x^4 + 11x^4 - 3x^4 = (5 + 11 - 3)x^4 = 13x^4. \end{aligned}
\begin{aligned} &15p + 21p = 36p, \\ &36p \div 6 = 6p. \end{aligned}
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