Câu hỏi: Không dùng máy tính hoặc bảng số , hãy so sánh:
a) √26+3 và √63
b) 1/2 và √3-1/2

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32

step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function

step-by-step explanation:

classify each pair of angles as alternate interior, same-side interior, or corresponding angles.