We expand this by substituting a = p, b = 3q and c = 7r into the identity. Squaring the individual items and finding their paired double products yields the answer.
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The remaining balance after x days is b(x) = 600 minus 15x. The balance becomes zero after 40 days. This represents linear decay because the balance decreases by the same 15 rupees every day.
In the algebraic expression 200l + 160w + 50lw, the terms are 200l, 160w and 50lw. The variables are l and w. The coefficients are 200, 160 and 50. There is no constant term in this expression.
NCERT Class 9 Ganita Manjari Maths Chapter 4 “Exploring Algebraic Identities” explains algebraic identities and their applications. It covers expansion formulas, factorisation concepts and how identities help simplify expressions and solve mathematical problems efficiently.
Chapter 9 “Atomic Foundations of Matter” explains how atoms combine to form matter. It covers molecules, elements, compounds and chemical formulas, helping me understand the composition, structure and properties of substances in everyday life clearly.