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Origin of algebra
Old way New way
With a variable 3 times x3×x3, times, x 3x3x3, x
Without variable 3 times 53×53, times, 5 3cdot 53⋅53, dot, 5 or 3(5)3(5)3, left parenthesis, 5, right parenthesis
evaluating
How to evaluate an expression with two variables
Let's say we want to evaluate the expression 10 + 2p - 3r10+2p−3r10, plus, 2, p, minus, 3, r. Well, first we need to know the values of pip and err. For example, to evaluate the expression when blued {p = 4}p=4start color #11accd, p, equals, 4, end color #11accd and {r = 5}r=5start color #e07d10, r, equals, 5, end color #e07d10, we just replace blued upstart color #11accd, p, end color #11accd with blued 44start color #11accd, 4, end color #11accd and gold start color #e07d10, r, end color #e07d10 with gold 55start color #e07d10, 5, end color #e07d10:
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